Update copyright year

configure.ac.in

 dnl vi:set et ai sw=2 sts=2 ts=2: */
 dnl
 dnl Copyright (c) 2007-2011 Jannis Pohlmann <jannis@xfce.org>
-dnl Copyright (c) 2012-2020 The Xfce development team
+dnl Copyright (c) 2012-2022 The Xfce development team
 dnl
 dnl This library is free software; you can redistribute it and/or
 dnl modify it under the terms of the GNU Library General Public
@@ -44,7 +44,7 @@ dnl ***************************
 dnl *** Initialize autoconf ***
 dnl ***************************
 AC_COPYRIGHT([Copyright (c) 2007-2011 Jannis Pohlmann <jannis@xfce.org>
-Copyright (c) 2012-2020 The Xfce development team
+Copyright (c) 2012-2022 The Xfce development team
               ])
 AC_INIT([garcon], [garcon_version], [https://gitlab.xfce.org/xfce/garcon])
 AC_PREREQ([2.69])

docs/reference/garcon-docs.xml

@@ -16,7 +16,7 @@
       <ulink role="online-location" url="https://developer.xfce.org/&package_name;/index.html">https://developer.xfce.org/&package_name;/</ulink>.
     </releaseinfo>
     <copyright>
-      <year>2021</year>
+      <year>2022</year>
       <holder>The Xfce Development Team</holder>
     </copyright>
   </bookinfo>